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3. lose marbles

lose marbles

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lose (all) one's marbles

 and lose one's mind

Fig. to go crazy; to go out of one's mind. What a silly thing to say! Have you lost your marbles? Look at Sally jumping up and down and screaming. Is she losing all her marbles? I can't seem to remember anything. I think I'm losing my mind.

See also: lose, marble

lose your marbles

to start forgetting things, behaving strangely, or becoming mentally ill I haven't lost my marbles yet. She's begun to lose her marbles, and there's nothing we can do.

See also: lose, marble

lose your marbles

  (informal)

to start acting in a strange way and forgetting things I may be old, but I haven't lost my marbles yet. (informal)

See also: lose, marble